Fire crews were called to 2824 Digby Ave. just before 7 a.m. to find smoke and fire coming from a second-story window on the side of the house.

Four people trapped above the fire on the third floor were rescued by firefighters.

The fire was brought under control within minutes. Investigators said the fire was caused by an electric space heater too close to bedding materials in a second-floor bedroom. Damage was estimated at $20,000.

Firefighters said seven people were displaced, mostly college students. One person was sent to the hospital for treatment of burns, while two others were treated for smoke inhalation.

"One of the roommates, a resident in the house, said it was a space heater, and a couple people were trapped in the attic," neighbor Sean Liggett said.

The attic had been turned into bedrooms for college students. It was just above the room where the fire started.